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参数资料
| 型号： | LM4921ITLX/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PBGA20 |
| 封装： | MICRO, SMD-20 |
| 文件页数： | 3/20页 |
| 文件大小： | 457K |
| 代理商： | LM4921ITLX/NOPB |
Application Information
SPI OPERATIONAL DESCRIPTION
The serial data bits are organized into a field which contains 16 bits of data defined by TABLE 1. Bits 1 & 2 determine the output
mode of the LM4921 as shown in TABLE 2. Bits 7 through 11 determine the volume level setting as illustrated by TABLE 3. Bit 12
sets the Bypass capacitor charging time.
Table 1. Bit Allocation
BIT #
Default Val
Function
Description
0 (LSB)
0
RESET_B
RESET_B = 0, Resets the DAC
Must be high for the part to run.
1
0
MODE CONTROL
See Table 2
2
0
3
0
MASTER/SLAVE
0 = SLAVE, 1 = MASTER
4
0
RESOLUTION
0 = 16 bit, 1 = 32 bit
5
0
RESERVED
Should always be set to '1'
6
0
ZERO CROSSING SET
0 = ZXD ENABLE, 1 = ZXD DISABLE
7
0
VOLUME CONTROL
See Table 3 - Volume Control Settings
8
0
9
0
10
0
11
0
12
0
BYP CHARGE RATE
0 = 1X, 1 = 2X
13
0
RESERVED
14
0
RESERVED
15 (MSB)
0
RESERVED
Should always be set to '0'
MODE CONTROL
Sets the modes as outlined in Table 2.
Table 2. Output Mode Selection (Bits 1 & 2 above)
Output Mode #
BIT 2
BIT 1
MODE
0
SD
1
0
1
STANDBY
2
1
0
MUTE
3
1
ACTIVE
Shutdown turns off the part completely for maximum power savings. The Standby mode turns off the clock but still consumes more
power than the shutdown mode. However, coming out of standby mode allows the part to turn back on faster than from shutdown.
In Mute mode the clocks remain on which uses more power but allows faster recovery and the ability to supply clock signals to
other devices which is important when the part is used in master mode. Active mode turns the part on for normal operation.
MASTER/SLAVE SELECT
Allows the part to act as a master and supply the clock for the
rest of the system or be a slave to the system clock.
RESOLUTION SET
Sets the resolution to be either 16 or 32 bits of stereo audio
information. For most applications this will be set at 16 bits.
ZERO CROSSING DETECT SET
This pin turns on the zero crossing detection circuit. With this
circuit enabled the part will not allow a volume step change,
or shutdown mode, or standby mode to occur until the audio
input signal passes through zero. This pin should be set to on
for most applications.
11
www.national.com
LM4921
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM4922 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Ground-Referenced, Ultra Low Noise, Fixed Gain, 80mW Stereo Headphone Amplifier |
| LM4922TL | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| LM4922TL/NOPB | 功能描述:音频放大器 RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| LM4922TLX/NOPB | 功能描述:音频放大器 RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| LM4923 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:1.1 Watt Fully Differential Audio Power Amplifier With Shutdown Select |
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